![]() ![]() Don’t forget that you can select fixed values if no column from the query has the info ( INSERT INTO X(p,c,age) SELECT personname, cityname, 23 FROM. Then, passing the values to the statement by calling the bindValue () method. Next, prepare the insert statement for execution by calling the prepare () method of the PDO object. The number of columns inserted to must match the number of columns selected. First, construct an INSERT statement that uses two named placed holders: :symbol and :company for binding values later. However, I trust that the general pattern shown first will suffice for your learning write a SELECT that shows the data you want to insert, then simply write INSERT INTO table(columns) above it. If you just want to mix every person with every city you can do: INSERT INTO employee(personname,cityname)īut be warned, two people and two cities will cause 4 rows to be inserted, and so on (20 people and 40 cities, 800 rows. ), (expression1 DEFAULT, expression2 DEFAULT. ) VALUES (expression1 DEFAULT, expression2 DEFAULT. Provide eg a cityname in Person (because it seems more likely that one city has many person) then you can do INSERT INTO employee(personname,cityname)īut even then, the tables are related between themselves and don’t need the third table so it’s perhaps something of an academic exercise only, not something you’d do in the real world Syntax The syntax for the PostgreSQL INSERT statement when inserting record (s) using the VALUES keyword is: INSERT INTO table (column1, column2. A simple example of Insert illustrating the target table and the VALUES clause at once: > from sqlalchemy import insert > stmt insert(usertable).values(name'spongebob', fullname'Spongebob Squarepants') The above stmt variable is an instance of Insert. In your case there isn’t really anything to join on because your one-column tables have no column in common. The general pattern for turning a select that has two base tables giving info, into an insert is: INSERT INTO table(column,list,here) ![]() There doesn’t appear to be any obvious relationship between city and person which will make your life hard ![]() The textbook I have for class doesn't dive into sub-queries like this and I can't find any examples similar enough to mine such that I can understand how to adapt them for this use case. Notice in the last block of code, where I'm doing an INSERT into the employee table, I don't know how to string together multiple SELECT sub-queries to get both the existing records from the person and city table such that I can create a new employee entry with attributes as such: create employee entry referencing existing records Create a employee table w/ForeignKey referenceĮname VARCHAR(255) REFERENCES person(pname) NOT NULL,Įcity VARCHAR(255) REFERENCES city(cname) NOT NULL, Create a city table + insert single row I am learning SQL (postgres) and am trying to insert a record into a table that references records from two other tables, as foreign keys.īelow is the syntax I am using for creating the tables and records: - Create a person table + insert single row ![]()
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